Strengths VERY COMFORTABLE MOWER, EASY TO OPERATE. i HAVE TEN ACRES TO MOW AND GOT THE X720 FOR MY FATHER TO PUTTER ON AND THE Z830 TO SPEED MOWING TIME. THE 830 RUNS LAPS AROUND THE 720 AND I WOULD ONLY GET THE 720, IN RETROSPECT, IF YOU WANT TO USE THE ATTACHMENTS. FOR MOWING GO TO THE ZERO TURN